1970 Map of San Gorgonio Mtn

About this map

San Gorgonio Mtn dominates this high-altitude landscape, anchoring the northern reaches of the San Gorgonio Wilderness. The map reveals a complex network of hydrological and industrial features, including the Penstock Powerhouse and a Diversion Dam on the South Fork Whitewater River. To the south, the Morongo Indian Reservation spans the foothills near Burro Flats, while the north is defined by prominent peaks like Jepson Peak and Grinnell Mtn. Evidence of early resource management and recreation is visible through labels like the Mill Creek Mine (Quarry), South Fork Cabin, and several remote mountain springs. The convergence of the San Bernardino Co and Riverside Co line cuts through the southern canyons, where the Whitewater River and Banning River systems originate. This survey details the transition from the alpine ridges of Ten Thousand Foot Ridge to the alluvial flats and canyons of the southern forest boundary.